A novel porphyrin-labeled poly(N-isopropylacrylamide): Spectral and luminescent properties

A novel water-soluble tetraarylporphyrin-containing polymer has been synthe sized by the reaction of bromoalkyl-containing poly(N-isopropylacrylamide) with 5-(4-pyridyl)-10,15,20-tri(4-methoxyphenyl)porphyrin. Some physicochem ical properties of the obtained polymers are reported. It has been shown th at a strong interaction between the porphyrin units takes place in liquid a queous medium at temperatures below the lower critical solution temperature (LCST). This phenomenon results in considerable broadening of the Soret ba nd in the absorption spectrum and in strong quenching of fluorescence. High er than LCST fluorescence enhancement is observed.